1. An analogous result was reported for the selenium dioxide oxidation of 2-hydroxyacetophenone [ R. Howe, B. S. Rao, and H. Heyneker, J. Chem. Soc. (C), 2510 (1967)).
2. Über Bildung und Autoxydation von Cumaranonen
3. A. Mustafa and A. M. Islam, J. Chem. Soc., 1616 (1951)].